Répondre :
Réponse :
Explications étape par étape :
9/7 x 14/15 = (3x3)x(7x2) / (7x3x5) je simplifie les 7
= (3x3x2) / (3x5) je simplifie un 3
= (3x2) / 5
= 6/5
7/8 x 3/14 x 4/9 = (7 x 3 x 4) / (8 x 14 x 9)
= (3 x4) / (8 x 2 x 9)
= 4 / (8 x 2 x 3)
= 1 / (2 x 2 x 3)
= 1/12
17/81 x 9/8 x 7/34 x 64/70
= (17 x 9 x 7 x 64) / (81 x 8 x 34 x 70)
= ( 1 x 9 x 7 x 64) / (81 x 8 x 2 x 70)
= ( 1 x 1 x 7 x 64) / ( 9 x 8 x 2 x 70)
= ( 1 x 1 x 1 x 64) / (9 x 8 x 2 x 10)
= 8 / (9 x 1 x 2 x 10)
= 4 / (9 x 2 x 10)
= 2 / (9 x 1 x 10)
= 1 / (9 x 5)
= 1/45
5x21 / 14x20 = 5x3x7/2x7x5x4
= 3x7/2x7x4
= 3/2x4
= 3/8
15x12/9x25 = 3x5x3x4/3x3x5x5
= 5x3x4/3x5x5
= 3x4/3x5
= 4/5
24x28/18x7 = 24x7x4/18x7
= 24x4/18
= 6x4x4/3x6
= 4x4/3
= 16/3
99x25/22x125 = 99x25 / 22x5x25
= 99 / 22x5
= 9x11 / 2x11x5
= 9 / 2x5
= 9/10
9x12x10 / 27x10x6 = 9x12 / 27x6
= 9x2x6 / 27x6
= 9x2 / 27
= 9x2 / 3x9
= 2/3
3x6x8 / 16x12x18 = 3x6x8 / 16x2x6x18
= 3x8 / 16x2x18
= 3x8 / 2x8x2x18
= 3 / 2x2x18
= 3 / 2x2x3x6
= 1 / 2x2x1x6
= 1/24